## IB Physics Glossary

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### Q

#### Quality factor

$Q$, is a measure of the ionization strength of various radioactive source.

 Radiation type Q $\alpha$ 20 Fast neutrons 10 Slow neutrons 3 Fast protons 1 $\beta, \gamma$, X-rays 1

 Keyword(s): I3

#### Quantum efficieny

is the ratio of emitted electrons to incident photons falling on a pixel.
Increasing the quantum efficiency makes the CCD more sensitive to light.
 Keyword(s): 14.2

#### Quasar

is a quasi-stellar radio source. A compact region in the center of a black hole. (d)
 Keyword(s): E5